Carcinoma in situ of skin (D04) ICD-10-CM
The D04 code range covers carcinoma in situ of skin with 29 ICD-10-CM diagnosis codes. 21 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the D04 Range 29 codes · 21 billable
- D04 Carcinoma in situ of skinNon-billable
- D04.0 Carcinoma in situ of skin of lip
- D04.1 Carcinoma in situ of skin of eyelid, including canthusNon-billable
- D04.10 Carcinoma in situ of skin of unspecified eyelid, including canthus
- D04.11 Carcinoma in situ of skin of right eyelid, including canthusNon-billable
- D04.111 Carcinoma in situ of skin of right upper eyelid, including canthus
- D04.112 Carcinoma in situ of skin of right lower eyelid, including canthus
- D04.12 Carcinoma in situ of skin of left eyelid, including canthusNon-billable
- D04.121 Carcinoma in situ of skin of left upper eyelid, including canthus
- D04.122 Carcinoma in situ of skin of left lower eyelid, including canthus
- D04.2 Carcinoma in situ of skin of ear and external auricular canalNon-billable
- D04.20 Carcinoma in situ of skin of unspecified ear and external auricular canal
- D04.21 Carcinoma in situ of skin of right ear and external auricular canal
- D04.22 Carcinoma in situ of skin of left ear and external auricular canal
- D04.3 Carcinoma in situ of skin of other and unspecified parts of faceNon-billable
- D04.30 Carcinoma in situ of skin of unspecified part of face
- D04.39 Carcinoma in situ of skin of other parts of face
- D04.4 Carcinoma in situ of skin of scalp and neck
- D04.5 Carcinoma in situ of skin of trunk
- D04.6 Carcinoma in situ of skin of upper limb, including shoulderNon-billable
- D04.60 Carcinoma in situ of skin of unspecified upper limb, including shoulder
- D04.61 Carcinoma in situ of skin of right upper limb, including shoulder
- D04.62 Carcinoma in situ of skin of left upper limb, including shoulder
- D04.7 Carcinoma in situ of skin of lower limb, including hipNon-billable
- D04.70 Carcinoma in situ of skin of unspecified lower limb, including hip
- D04.71 Carcinoma in situ of skin of right lower limb, including hip
- D04.72 Carcinoma in situ of skin of left lower limb, including hip
- D04.8 Carcinoma in situ of skin of other sites
- D04.9 Carcinoma in situ of skin, unspecified
About the D04 Code Range
The ICD-10 code D04 and its subcategories are used to classify carcinoma in situ of the skin, a form of non-invasive skin cancer confined to the outer layer of the skin. These codes specify the exact location of the carcinoma, such as lip, eyelid, ear, face, scalp, trunk, limbs, and other skin sites.
Carcinoma in situ is often called by synonyms like "intraepidermal squamous carcinoma" or "Bowen's disease," which are included in the detailed ICD-10 coding. For example, D04.0 covers carcinoma in situ of the lip, and D04.9 is used for unspecified sites, incorporating terms such as squamous cell carcinoma in situ or basal cell carcinoma in situ. These distinctions help medical coders assign the proper ICD-10 code for carcinoma in situ of skin based on the precise anatomical location and variant, aiding in targeted clinical documentation and treatment planning. Using the correct code ensures clarity for healthcare providers when tracking and managing pre-invasive skin cancers in various body areas.
Questions About This Page
How many billable codes are in the D04 range?
Of the 29 codes in this range, 21 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the D04 range classify?
The range classifies carcinoma in situ of skin. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
